| Na~+和卤素修饰的Ag/MgO催化剂在丙烯环氧化反应中的催化性能 |
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| 引用本文： | 王琳琳,杨绿娟,张庆红,王野.Na~+和卤素修饰的Ag/MgO催化剂在丙烯环氧化反应中的催化性能[J].厦门大学学报(自然科学版),2010,49(2). |
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| 作者姓名： | 王琳琳 杨绿娟 张庆红 王野 |
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| 作者单位： | 厦门大学,化学化工学院,固体表面化学国家重点实验室,福建,厦门,361005 |
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| 摘 要： | 制备了一系列未经修饰和经Na+和卤素修饰的5%(质量分数)Ag/MgO催化剂.考察了富氧条件(p(C3H6)∶p(O2)=2.53∶98.8)下,Na+和卤素的修饰对Ag/MgO催化剂的丙烯环氧化反应性能的影响.研究发现,添加于催化剂中的Na+有助于环氧丙烷选择性的提高,而与Na+共存的Cl-和Br-则显著增加环氧丙烷的选择性.氧程序升温脱附(O2-TPD)表征显示,Ag/MgO催化剂中Na+和Cl-的添加提高了催化剂中次表面氧的含量和稳定性,从而促进了其在丙烯环氧化反应中的催化性能.
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| 关 键 词： | 银基催化剂 碱金属离子 氯离子 丙烯环氧化 |
Epoxidation of Propylene over Ag/MgO Catalysts Modified Na~+ and Halogen Anions |
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| WANG Lin-lin,YANG Lu-juan,ZHANG Qing-hong,WANG Ye.Epoxidation of Propylene over Ag/MgO Catalysts Modified Na~+ and Halogen Anions[J].Journal of Xiamen University(Natural Science),2010,49(2). |
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| Authors: | WANG Lin-lin YANG Lu-juan ZHANG Qing-hong WANG Ye |
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| Abstract: | A series of 5%(by mass)Ag/MgO catalysts modified with and without Na~+ and halogen anions were prepared,and the performances of these catalysts for epoxidation of propylene were studied under O_2-rich condition (p(C_3H_6)∶ p(O_2)=2.53∶98.8) by using oxygen as oxidant.It was found that catalysts modified with Na~+ showed higher selectivity for PO formation.Furthermore,Cl~- or Br~- coexisted with Na~+ in the catalysts could also lead to obvious increase of PO selectivity(＞20%).O_2-TPD characterization suggested that N~+ and Cl~- in the catalysts stabilized subsurface oxygen species O_β,and this might favor the formation of PO. |
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| Keywords: | O_2-TPD silver-based catalysts sodiumion chlorion propylene epoxidation O_2-TPD |
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